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Skin-brightening compositions and methods

a technology of compositions and skin, applied in the field of skin brightening compositions, can solve the problems of ammonia and persulfate based alkaline boosters, strong odors, and general disagreeability of most consumers

Active Publication Date: 2019-05-30
LOREAL SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a skin-brightening cosmetic composition that includes hydrogen peroxide, at least one ammonia-free and persulfate-free alkaline booster with optional catalysts, and at least one fatty compound present in an amount of about 30% or more, based on the weight of the composition. This composition demonstrates efficiency in whitening that is at least the same as with ammonia-containing compositions. The composition can also include surfactants, polymers, chelating agents, and vitamins. When used repeatedly over time, the composition can affect a change in skin brightness and radiance. Overall, this patent describes a formula that helps make skin brighter and more glowy.

Problems solved by technology

One of the difficulties encountered when composing skin-brightening compositions arises because the compositions include alkaline boosters and most commonly used alkaline boosters include aqueous ammonia and / or persulfate.
Ammonia and persulfate based alkaline boosters are known to be strong smelling and generally disagreeable to most consumers both in terms of smell as well as skin sensitivity.
And the volatility of the ammonia and persulfate based alkaline boosters typically requires that the amount of booster needed must take into account the amount that will be lost due to volatilization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

ith In Vitro Hair and Stratum Corneum Change in Luminosity, Inventive Compositions and Compositions Comprising Ammonia

[0081]Inventive composition is the Inventive Example 1 shown in Table 3, wherein Part A and Part B are combined in equal amounts just prior to application.

[0082]Comparative composition is the Comparative Example 1 shown in Table 4 (includes ammonium bicarbonate as booster).

TABLE 1Lightening efficacy of compositions with and withoutammonia in in vitro hair and stratum corneum test:Comparative Example 1Inventive Example 1PART APART BPART APART BH2O27%7%Guanidine  4%4%BicarbonateAmmonium1.12%Bicarbonateoil50605060Fla 1 = Part A:Part B 1:1Fla 2 = Part A:Part B 1:1pH = 9.0 ± 0.5pH = 9.0 ± 0.5ΔL on hair swatch5.12 ± 0.213.7 ± 0.16ΔL on SC with1.4 ± 0.21.3 ± 0.5 brown background

[0083]In vitro hair swatch test showed that the inventive composition lacking ammonia provides significantly decreased lightening efficacy as compared with the comparative composition, while both inv...

example 2

Stratum Corneum Change in Luminosity, Inventive Compositions with and without Oil and Over Multiple Applications

[0084]Inventive composition is the Inventive Example 1 shown in Table 3 wherein Part A and Part B are combined in equal amounts just prior to application.

[0085]Comparative composition is the Comparative Example 2 shown in Table 4 (without oil).

[0086]In vitro stratum corneum tests were conducted with and without oil, and over one or multiple applications. Table 2 provides the results.

TABLE 2In vitro SC test shows that the efficacy increases with the increased oilcontent and increased number of application:ComparativeExample 2InventiveInventiveInventive(without oil)Example 1Example 1Example 1PART APART BPART APART BPART APART BPART APART BH2O27%7%7%7%Guanidine4%4%4%4%Bicarbonateoil00506050605060Fla 1 = Part A:PartFla 2 = Part A:PartFla 2 = Part A:PartFla 2 = Part A:PartB 1:1B 1:1B 1:1B 1:1pH = 9.0 ± 0.5pH = 9.0± 0.5pH = 9.0 ± 0.5pH = 9.0 ± 0.5# of1123applicationon SCΔL on SC...

example 3

tratum Corneum Change in Luminosity Over Multiple Applications, Comparing Inventive Composition with Hydroquinone Containing Composition

[0088]Inventive composition is the Inventive Example 1 shown in Table 3 wherein Part A and Part B are combined in equal amounts just prior to application.

[0089]Comparative composition comprises hydroquinone.

[0090]In vivo tests were conducted as described above, with application of the compositions being made on the back of test subjects. The inventive compositions were applied twice weekly over four weeks; comparative compositions containing Hydroquinone at 2% were applied five times per week over four weeks, These results in vivo follow the same trend as the in vitro results, demonstrating that an increased change in brightness can be achieved, for example an increase in brightness of ΔL=1.3 after two applications per week for 4 weeks using an inventive composition according to the disclosure as compared with a modest increase in brightness of only...

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Abstract

A cosmetic composition for brightening skin and a method for brightening skin using the cosmetic composition are provided. The cosmetic composition is ammonia-free and persulfate-free, and includes hydrogen peroxide, at least one alkaline booster and at least one fatty compound present from about at least 30% by weight, based upon the total weight of the composition. The method for brightening skin includes applying to the skin a composition provided as a multi-part system, the parts separately containing two or more sub-compositions each of which comprises one of the hydrogen peroxide and the alkaline booster, one or both comprising a fatty compound component, the sub-combinations combinable at the time of use.

Description

FIELD OF THE INVENTION[0001]The present invention is generally directed to a cosmetic composition for brightening skin and a method for brightening skin using the cosmetic composition. More particularly, the present invention is directed to a cosmetic composition for brightening skin comprising hydrogen peroxide, at least one ammonia-free and persulfate-free alkaline booster and at least one fatty compound present from about at least 30% by weight, based upon the total weight of the composition, and a method for brightening skin using the cosmetic composition. The composition is characterized as ammonia-free and persulfate-free.BACKGROUND OF THE INVENTION[0002]A variety of skin compositions are known that can provide skin brightening benefits. Typically, such products employ oxidizing agents to achieve brightening, and include alkaline boosters to activate the oxidizing agents. One of the difficulties encountered when composing skin-brightening compositions arises because the compos...

Claims

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Application Information

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IPC IPC(8): A61K8/19A61Q19/02A61K8/22A61K8/368A61K8/43A61K8/44
CPCA61K8/19A61Q19/02A61K8/22A61K8/368A61K8/43A61K8/44A61K2800/524A61K2800/882A61K8/31A61K8/41A61K2800/30
Inventor CHEN, REBECCABERNARD, ANNE-LAURE SUZANNEAGACH, MICKAEL ANGEHERCOUET, LEILA SAFIA CAMILLEHUGUET, ETIENNE
Owner LOREAL SA